Use AWS SDK

import AWSS3StoragePlugin

do {
    // Retrieve the reference to AWSS3StoragePlugin
    let plugin = try Amplify.Storage.getPlugin(for: "awsS3StoragePlugin")
    guard let storagePlugin = plugin as? AWSS3StoragePlugin else {
        return
    }

    // Retrieve the reference to S3Client
    let s3Client = storagePlugin.getEscapeHatch()

    // Make requests using s3Client...
    // ...
} catch {
    print("Get escape hatch failed with error - \(error)")
}